Cam and sniffer
05-23-2005, 04:43 PM
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Cam and sniffer I'm currently living in NYC, but maybe returning to the UK at some point.
My next C5 will probably be modded, but I need to make sure that whatever cam it has in it will pass UK emissions regs. These are:
Max HC @ 2,000rpm = 200ppm
Max CO @ 2,000rpm = 0.3%
Max CO @ Idle = 0.5%
Can anyone translate these numbers into approx. cam specs?
I'm thinking that anything with an exhaust duration up to ~230 on a 112LSA should be OK. What do you think?
Cheers,
Ian.
My next C5 will probably be modded, but I need to make sure that whatever cam it has in it will pass UK emissions regs. These are:
Max HC @ 2,000rpm = 200ppm
Max CO @ 2,000rpm = 0.3%
Max CO @ Idle = 0.5%
Can anyone translate these numbers into approx. cam specs?
I'm thinking that anything with an exhaust duration up to ~230 on a 112LSA should be OK. What do you think?
Cheers,
Ian.
05-23-2005, 04:55 PM
#2
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I have no idea how to get those numbers. Do you know how they compare to tests in the states? I'd venture a guess that a 230 duration on a 112 will not pass. Around here people never seem to go larger than 224 on a 112. Any larger and you get positive overlap which is a big detriment to emisisons.
05-23-2005, 05:27 PM
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Originally Posted by blkZ28spt
I have no idea how to get those numbers. Do you know how they compare to tests in the states?
My thinking is that an aftermarket cam is gonna impact HC more than CO. 200ppm is 4x the CA limit, so that means I should be able to get away with something fairly aggressive(?). Don't know if the UK regs match closely with some other state here in the US?
Cheers,
Ian.